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Claude Opus 5.5 vs Gemini 4 Argon

Claude Opus 5.5 leads Gemini 4 Argon on coding, 88.8 to 81.0 on the Vibe Coding Index, and Gemini 4 Argon costs 2.0x less per output token ($10.00 vs $20.00 per million). Updated October 22, 2026; 93 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Gemini 4 Argon
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
55
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
36
vs boards won of 93 shared, 2 tied

Claude Opus 5.5 or Gemini 4 Argon: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 81.0 for Gemini 4 Argon.

Pick Gemini 4 Argon for output tokens 2.0x cheaper ($10.00 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
93
Claude Opus 5.5 only
16
Gemini 4 Argon only
1
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 5.5 88.8 from 5 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 11.4 points apart on average over 18 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Opus 5.5 91.3% against Gemini 4 Argon 52.5%, 38.8 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Gemini 4 Argon $10.00 per million output tokens, 2.0x apart.
Context window
Claude Opus 5.5 takes 1M tokens, Gemini 4 Argon 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 5.5BarsGemini 4 ArgonTies
Coding156
Intelligence20
Agentic work117
Reasoning651 tie
Math321 tie
Knowledge06
Web design70
General1110
All shared boards55362 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index156
Coding benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
LiveBench coding96.3%89.7%Claude Opus 5.5
LMArena WebDev18071678Claude Opus 5.5
Terminal-Bench 4 (Vals AI)65.2%57.6%Claude Opus 5.5
Vibe Code Bench (Vals AI)90.3%91.9%Gemini 4 Argon
Code migration (Vals AI)66.7%68.2%Gemini 4 Argon
ProgramBench (Vals AI)18.5%2.5%Claude Opus 5.5
IOI (Vals AI)95.1%100.0%Gemini 4 Argon
Terminal-Bench 2.1 (Vals AI)87.6%57.7%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)70.2%56.0%Claude Opus 5.5
Vibe Code Bench 1-100 (Vals AI)30.4%21.2%Claude Opus 5.5
CyberBench (Vals AI)74.6%77.9%Gemini 4 Argon
SciCode66.9%61.8%Claude Opus 5.5
FrontierCode54.6%47.5%Claude Opus 5.5
FrontierSWE62.3%55.0%Claude Opus 5.5
MirrorCode77.4%58.9%Claude Opus 5.5
ALE-Bench2147.42100.1Claude Opus 5.5
LMArena Text: coding15451546Gemini 4 Argon
LMArena Text: software and IT15381556Gemini 4 Argon
LMArena WebDev: React18551692Claude Opus 5.5
LMArena WebDev: HTML17531643Claude Opus 5.5
LMArena WebDev: from an image1753Not measuredOnly Claude Opus 5.5 measured
SciCode18.5%12.3%Claude Opus 5.5
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
AA Intelligence Index57.652.6Claude Opus 5.5
Epoch Capabilities Index168.8166.4Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index117
Agentic work benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
Design Arena: agents building web apps1316Not measuredOnly Claude Opus 5.5 measured
Design Arena: agents building mobile apps1308Not measuredOnly Claude Opus 5.5 measured
Design Arena: spreadsheets13681157Claude Opus 5.5
LiveBench research85.0%83.1%Claude Opus 5.5
LiveBench browser80.0%92.0%Gemini 4 Argon
LiveBench long agentic85.0%69.9%Claude Opus 5.5
SREBench (Vals AI)33.6%44.3%Gemini 4 Argon
Finance Agent (Vals AI)58.6%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)45.6%44.6%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%54.8%Gemini 4 Argon
Harvey's Legal Agent Benchmark (Vals AI)9.2%27.1%Gemini 4 Argon
Excel Modeling Benchmark (Vals AI)75.9%75.2%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%76.3%Claude Opus 5.5
Terminal-Bench-Science (Vals AI)47.1%44.3%Claude Opus 5.5
Vals Science Index58.7%55.4%Claude Opus 5.5
Time Horizon Index (Vals AI)91.3%52.5%Claude Opus 5.5
CUA-bench (Vals AI)14.0%4.8%Claude Opus 5.5
Robo-bench (Vals AI)14.6%0.8%Claude Opus 5.5
APEX-Agents73.5%82.4%Gemini 4 Argon
Remote Labor Index21.3%Not measuredOnly Claude Opus 5.5 measured
SpireClimb3.3%Not measuredOnly Claude Opus 5.5 measured
Vending-Bench 2$9,235$13,718Gemini 4 Argon
LMArena Search1213Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index65
Reasoning benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
LiveBench reasoning92.2%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)49.5%45.5%Claude Opus 5.5
Humanity's Last Exam (Artificial Analysis run)61.4%57.1%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%96.4%Gemini 4 Argon
ARC-AGI98.5%98.5%Tie
ARC-AGI-293.3%91.3%Claude Opus 5.5
Chess puzzles67.0%59.0%Claude Opus 5.5
Mystery game puzzles71.0%64.0%Claude Opus 5.5
EBR-bench71.4%64.8%Claude Opus 5.5
LMArena Text: hard prompts15361546Gemini 4 Argon
LMArena Text: expert15491550Gemini 4 Argon
LMArena Text: hard prompts in English15351548Gemini 4 Argon
LMArena Vision: diagrams1345Not measuredOnly Claude Opus 5.5 measured
LMArena Vision: homework1362Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 391.2%86.0%Claude Opus 5.5
FrontierMath, tier 495.0%78.0%Claude Opus 5.5
ProofBench100.0%99.0%Claude Opus 5.5
LMArena Text: math15181536Gemini 4 Argon
LMArena Text: mathematical work15161557Gemini 4 Argon
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
LegalBench (Vals AI)Not measured88.3%Only Gemini 4 Argon measured
MedCode (Vals AI)49.8%58.8%Gemini 4 Argon
SimpleQA Verified72.2%76.0%Gemini 4 Argon
LMArena Text: science15241548Gemini 4 Argon
LMArena Text: medicine and healthcare15091555Gemini 4 Argon
LMArena Text: legal and government15181548Gemini 4 Argon
LMArena Text: business and finance14941525Gemini 4 Argon
FACTS Benchmark Suite65.3%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 10 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
Design Arena: websites13351315Claude Opus 5.5
Design Arena: UI components13851333Claude Opus 5.5
Design Arena: game dev14611377Claude Opus 5.5
Design Arena: data viz13971332Claude Opus 5.5
Design Arena: 3D14761388Claude Opus 5.5
Design Arena: all code categories13901329Claude Opus 5.5
Design Arena: SVG1329Not measuredOnly Claude Opus 5.5 measured
LiveBench design86.9%73.7%Claude Opus 5.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index1110
General benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
Vals Index70.2%69.2%Claude Opus 5.5
LiveBench data analysis80.3%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)70.6%69.8%Claude Opus 5.5
SAGE (Vals AI)45.8%53.6%Gemini 4 Argon
MedScribe (Vals AI)91.4%87.4%Claude Opus 5.5
Long context reasoning (AA-LCR)84.7%79.7%Claude Opus 5.5
DTBench98.9%97.6%Claude Opus 5.5
LMCA68.2%63.7%Claude Opus 5.5
Furniture assembly83.3%72.5%Claude Opus 5.5
LMArena Text15161532Gemini 4 Argon
LMArena Text: instruction following15371534Claude Opus 5.5
LMArena Text: creative writing15351527Claude Opus 5.5
LMArena Vision1321Not measuredOnly Claude Opus 5.5 measured
LMArena Text: English15191538Gemini 4 Argon
LMArena Text: non-English15071522Gemini 4 Argon
LMArena Text: Chinese15821611Gemini 4 Argon
LMArena Text: Japanese1534Not measuredOnly Claude Opus 5.5 measured
LMArena Text: French1493Not measuredOnly Claude Opus 5.5 measured
LMArena Text: Spanish15081503Claude Opus 5.5
LMArena Text: Russian15171534Gemini 4 Argon
LMArena Text: multi-turn15011556Gemini 4 Argon
LMArena Text: longer queries15321547Gemini 4 Argon
LMArena Text: writing and language15321529Claude Opus 5.5
LMArena Text: entertainment and media15151527Gemini 4 Argon
LMArena Vision: English1317Not measuredOnly Claude Opus 5.5 measured
LMArena Vision: reading text1326Not measuredOnly Claude Opus 5.5 measured
LMArena Vision: creative writing1320Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 19 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5.5 and Gemini 4 Argon
BenchmarkClaude Opus 5.5Gemini 4 ArgonLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 5.5$0.014Fits in one request
Gemini 4 Argon$0.0070Fits in one request

Gemini 4 Argon costs less

Repository review

50K input + 3K output tokens

Claude Opus 5.5$0.260Fits in one request
Gemini 4 Argon$0.130Fits in one request

Gemini 4 Argon costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5.5$1.00Fits in one request
Gemini 4 Argon$0.500Fits in one request

Gemini 4 Argon costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 5.5 and Gemini 4 Argon
SpecificationAnthropic Claude Opus 5.5Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$4.00$2.00
Output $/Mtok$20.00$10.00
Coding index88.881.0
Independent measurements behind it55
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5.5 better than Gemini 4 Argon for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 81.0 for Gemini 4 Argon. Pick Gemini 4 Argon for output tokens 2.0x cheaper ($10.00 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5.5 or Gemini 4 Argon?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Gemini 4 Argon costs $2.00 and $10.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Opus 5.5 or Gemini 4 Argon?

Gemini 4 Argon, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5.5 vs Gemini 4 Argon comparison based on?

93 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5.5's coding index rests on 5 independent benchmarks and Gemini 4 Argon's on 5. Where only one model has a result, the page says so instead of naming a winner.

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